What is the coefficient of kinetic friction between the puck and the ice?

A hockey puck is hit on a frozen lake and starts moving with a speed of 13.40 m/s. Exactly 5.8 s later, its speed is 7.40 m/s.
What is the coefficient of kinetic friction between the puck and the ice?
how do you do this?? what formula(s) are used?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).